<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 添加角色按钮区 -->
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>

      <!-- 角色列表区 -->
      <el-table :data="roleList" borde stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row :class="['bdbottom', i1==0 ? 'bdtop' : '', 'vcenter']" 
                    v-for="(item1, i1) in scope.row.children" :key="item1.id">
              <!-- 渲染一级权限 -->
              <el-col :span="5" >
                <el-tag closable @close="removeRightById(scope.row, item1.id)">{{item1.authName}}</el-tag>
                <!-- 小箭头图标 -->
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级和三级权限 -->
              <el-col :span="19">
                <!-- 通过for循环嵌套二级权限 -->
                <el-row v-for="(item2,i2) in item1.children" :key="item2.id"
                        :class="[i2==0 ? '' : 'bdtop', 'vcenter']">
                  <el-col :span="6">
                    <el-tag type="success"
                            closable @close="removeRightById(scope.row, item2.id)">{{item2.authName}}</el-tag>
                    <!-- 小箭头图标 -->
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <el-tag type="warning" v-for="(item3,i3) in item2.children" 
                            :key="item3.id" closable @close="removeRightById(scope.row, item3.id)">{{item3.authName}}</el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column label="#" type="index"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作">
          <template slot-scope="scope" width="300px">
            <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
            <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
            <el-button size="mini" type="warning" icon="el-icon-setting"
                        @click="showSetRightDialog(scope.row)">分配权限</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <!-- 分配权限的对话框 -->
    <el-dialog title="分配权限" :visible.sync="SetRightDialogVisible"
                width="50%" @close="setRightDialogClosed">
      <!-- 树形控件 -->
      <el-tree :data="rightsList" :props="treeProps" show-checkbox
                node-key="id" default-expand-all
                :default-checked-keys="defkeys"
                ref="treeRef"></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="SetRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
  export default {
    name: "Roles",
    data() {
      return {
        //所有角色列表数据
        roleList: [],
        SetRightDialogVisible: false, //控制分配权限对话框的显示与隐藏
        rightsList: [], //所有权限的数据
        treeProps: { //树形控件的绑定对象
          label: 'authName',
          children: 'children',
        },
        defkeys:[], //默认选中节点id值的数组
        roleId: '', //当前即将分配权限的id
      }
    },
    created() {
      this.getRolesList()
    },
    methods: {
      //获取所有角色数据
      async getRolesList() {
        const {data:res} = await this.$http.get('roles')
        if(res.meta.status != 200) {
          return this.$message.error('获取角色列表失败！')
        }
        this.roleList = res.data
        // console.log(this.roleList);
      },
      //根据id删除对应的权限
      async removeRightById(role, rightId) {
        //弹框提示用户是否要删除
        const confirmResult =  await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)
        if(confirmResult != 'confirm') {
          return this.$message.info('取消了删除！')
        }
        const {data:res} = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
        if(res.meta.status != 200) {
          return this.$message.error('删除权限失败！')
        }
        // this.getRolesList() //这样会导致整个页面的刷新，所以用下面这样的方法来刷新
        role.children = res.data
      },
      //展示分配权限的对话框
      async showSetRightDialog(role) {
        this.roleId = role.id
        //在布尔值变成true之前获取到所有权限的数据
        const {data:res} = await this.$http.get('rights/tree')
        if(res.meta.status != 200) {
         return this.$message.error('获取权限数据失败！')
        }
        this.rightsList = res.data //获取到的权限数据，保存到data中
        // console.log(this.rightsList);

        //递归获取三级菜单的节点
        this.getLeafKeys(role, this.defkeys)

        this.SetRightDialogVisible = true
      },

      //通过递归的形式，获取角色下所有三级权限的id，并保存到defkeys数组中
      getLeafKeys(node, arr) {
        //如果当前node节点不包含children属性，则是三级节点
        if(!node.children) {
          return arr.push(node.id)
        }
        node.children.forEach(item => this.getLeafKeys(item, arr))
      },
      //监听分配权限对话框的关闭事件
      setRightDialogClosed() {
        //每次点击分配权限后，都会保留上次的结果，所以在关闭时需要给defkeys重新赋值
        this.defkeys = []
      },
      //点击为角色分配权限
      async allotRights() {
        const keys = [
          ...this.$refs.treeRef.getCheckedKeys(),
          ...this.$refs.treeRef.getHalfCheckedKeys(),
        ]
        const idStr = keys.join(',')

        const {data:res} = await this.$http.post(`roles/${this.roleId}/rights`, {rids:idStr})
        if(res.meta.status != 200) {
          return this.$message.error('分配权限失败！')
        }
        this.$message.success('分配权限成功！')
        this.getRolesList()
        this.SetRightDialogVisible = false
      }
    }
  }
</script>

<style lang="less" scope>
  .el-tag {
    margin: 7px;
  }
  .bdtop {
    border-top: 1px solid #eee;
  }
  .bdbottom {
    border-bottom: 1px solid #eee;
  }

  .vcenter {
    display: flex;
    align-items: center;
  }
</style>